Adjustable form for building tubular structures.



R. 0. BLAYNEY.

ADJUSTABLE FORM FOR BUILDING TUBULAR STRUCTURES.

APPLICATION nun) APR. 16, 1910.

1,001 ,500. Patented Aug. 22, 1911.

COLUMBIA PLANDORAPII $0.. WASIHNIITON. D. c.

ROBERT OSCAR BLAYNEY, OF NIAGARA FALLS, ONTARIO, CANADA.

ADJUSTABLE FORM FOR BUILDING TUBULAR STRUCTURES.

Ltitldfitit).

Specification of Letters Patent.

Application filed April 16, 1910.

Patented Aug. 22, 1911. Serial No. 555,927.

To all whom (It may concern:

Be it known that I, l-tonnn'r ()scnn BLAY- Nnr, a subject of the King of Great Britain, and resident of the city 01? Niagara Falls, in the county of lVelland, in the Province of Ontario, in the Dominion of Canada, have invented certain new and useful Improvements in Adjustable Forms for Building Tubular Structures, of which the following is a specification.

The invention relates to improvements in adjustable forms for building tubular structures, as described in the following specilication and illustrated in the accompanying drawings that form part of the same.

The invention consists essentially in the novel construction and arrangement of parts whereby a plurality of removable segments are supported from a common support to form a core and whereby a plurality of segments are secured together to form an outer shell.

The objects of the invention are to eticct a saving of time and labor in building conduits of various forms, to reduce expense and to devise a device of simple, strong and durable construction which may be easily and quickly removed and replaced in segments and which will lend itself to various forms.

In the drawings, Figure 1 is a perspective view of my device shown set in position. Fig. 2 is a cross sectional view of the device for forming a circular conduit. Fig. 3 is a perspective detail of one of the core segments.

Like numerals of reference indicate corresponding parts in each figure.

Referring to the drawings, 1 and 2 are lengths of pipe secured together by the removable collar 3.

4 are supporting members formed of a segment of metal each having a pair 01' legs 5 rigidly secured therein and extending outwardly therefrom, said legs being adapted to rest on the ground or on a suitable base and formed so that they may be adjusted longitudinally.

6 are set screws extending through threaded orifices in the segment 41; and arranged in pairs diametrically opposite one to the other. The opening in the segment 41 is sulficiently large to allow the pipe to be inserted thcreinto from the side. In the form of conduit construction where a saddle or base of masonry is first placed in the trench. the legs of the supporting members supporting the pipes rest upon the said base and hold the pipe securely in the desired position.

7 are segmental plates having the in wardly turned parallel side llanges 8 and the radially arranged imvardly turned flanges 9 at the ends. The plates 7 are formcdto the desired radius for the conduit to be constructed and a plurality of said plates are adapted to lit together with their end flanges abutting and to term the core or inner mold. These plates may be bent in any desired shape to give the desired shape to the mold.

10 are arms rigidly secured to the inner sides of the plates 7 and extending radially inward therefrom and having the braces 11 secured thereto and extending outwardly and secured to the said plates adjacent to the end flanges.

'19 are a plurality of arms having the oil'- set end portions 12) adapted to receive the ends of the arms 10, both portions having suitable bolt holes theretln'ough through which the bolts 141 are inserted to secure the said arms rigidly together.

15 are rigid segmental members fixedly secured to the inner ends of the arms 12 and having the set screws 1(3 threaded therein and arranged diametrically opposite the one to the other. The openings in the segments 15 are sullieiently large to allow the same to be readily placed over the pipe.

17 are curved washers loosely secured to the ends of the set screws (3 and 1t and adapted to lit snugly against the periphery of the supporting pipe 1. Two 01 the segmental members for forming the mold are formed with one end llange 18 parallel the one to the other so that the segment 1.) which is formed with parallel cud llangcs 20 will fit snugly between the flanges 18. It will thus be seen that the segment 19 may be drawn inwardly and will allow the other members of the section of the core to be removed. The segmental plates '7 and 15) have suitable bolt holes through the side and end flanges so that bolts may be placed lherethrough to secure the bolts together to form a rigid core section. Any desired number of these core sections may be supported from the pipe 1 and they may be removed from the completed end of the conduit by simply removing the bolts and drawing the segment 19 inwardly and then removing the other segments. They may be then carried to the forward end of the work and added to that end thus lengthening the mold.

21 are metal plates arc-shaped in form and having outwardly extending parallel side flanges 22 and outwardly extending -radially arranged end flanges 23. The plates 21 are formed of a suitable radius or shape to conform to the contour of the core, leaving the desired space between the core and the outer shell formed thereby for the con crete or other material desired to be placed therebetween. The plates 21 are rigidly bolted together and form a temporary and rigid outer wall to retain the building ma: terial. The top outer plates are formed with holes 2st therethrough through which soft concrete may be poured. It may be found desirable in some cases to support the outer shell from the core and in such cases suitable bolts or pins 25 are inserted through the outer or inner casings as de sired to form spacing members.

In the use of this device, a length of pipe is set up in the desired position, being supported by the members at and the core built up of a plurality of sections as desired for any desired length, the plates being of the desired shape to form a core of the desired cross section. In cases where the conduit is to be built of concrete alone, the outer casing is spaced around the core and held therefrom by the spacing members 25. The concrete filling is then poured through the top of the mold formed by the inner and outer plates and the whole mold filled. As soon the section of the conduit is set, the plates surrounding the first end constructed are removed and the inner plates also disconnected and Withdrawn and connected together and supported from the pipe 1 at the front end of the core. This process may be continued on throughout the construction of the conduit, the one set of core and mold plates being sutlicient to carry on the work. In the event of the spacing members 25 be ing secured to the outer orinner plates it will be necessary to fill the holes left by said members on their withdrawal but the members may be of a suitable material and left embedded in the cement. It will also be understood that the core may be used quite independently of the outer casing so that brick work or reinforced concrete may be formed therearound. The core presents a smooth outer surface and leaves the conduit with a uniform and smooth inner wall.

lVhat I claim my invention is 1. In an adjustable form for building tubular structures, the combination with adj ustable legs supported from a suitable bed, of a central longitudinal horizontal mem- ;ber rigidly held by said adjustable legs, and

,a concentric core comprising a plurality of inwardly flanged segmental plates detachably connected together and each supported from said central longitudinal member by a radial arm rigidly and detachably secured Ito said central horizontal member.

2. In an adjustable form for building tubular structures, a central member suitably supported, a plurality of radlal arms adjustably secured to said supporting memvber, a segmental plate secured. to one of said :radial arms and having inturned and par- :allelly arranged side and end flanges, apair of segmental plates, each supported. from one of said radial arms and having flanges at one side adapted to abut the parallel side flanges of the aforesaid plate and the outer side flanges arranged radially, and a plurality of segmental plates having inturned side flanges and parallel end flanges and said plates being adapted to fit together to form a core with an unbroken outer surface.

3. In an adjustable form for building tubular structures, a horizontal central cylindrical supporting member, a segmental collar partially encircling said supporting members at each end thereof and having,

supporting legs extending therefrom, means for adjustably securing said cylindrical member within said collars, a plurality of arms adjustably and removably secured to said cylindrical member, and a plurality of segmental plates supported from said arms and secured together to form a core.

Signed at Niagara Falls, Ont. this 4th day of April 1910.

ROBERT OSCAR BLAYNEY. Witnesses VVINNIFRED STEVENS, M. E. BLAYNEY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents- Washington, D. C. 

